scholarly journals 2017 Korea-Canada-U.S.A. Beaufort Sea (offshore Yukon and Northwest Territories) research program: processing of 2-D seismic data collected during expedition ARA08C

2019 ◽  
Author(s):  
M J Duchesne ◽  
S -G Kang ◽  
U Jang
Keyword(s):  
Northwest Territories ◽  
Research Program ◽  
Seismic Data ◽  
Beaufort Sea

scholarly journals Albedo of Melting Sea Ice in the Southern Beaufort Sea

1971 ◽  
Vol 10 (58) ◽  
pp. 101-104 ◽  
Author(s):  
M.P. Langleben
Keyword(s):  
Sea Ice ◽  
Northwest Territories ◽  
Beaufort Sea ◽  
Ice Cover ◽  
Short Wave ◽  
Wave Radiation ◽  
Short Wave Radiation ◽  
Melting Period ◽  
Fast Ice ◽  
Made In

AbstractTwo Kipp hemispherical radiometers mounted back to back and suspended by an 18 m cable from a helicopter flying at an altitude of about 90 m were used to make measurements of incident and reflected short-wave radiation. The helicopter was brought to a hovering position at the instant of measurement to ensure that the radiometers were in the proper attitude and a photograph of the ice cover was taken at the same time. The observations were made in 1969 during 16 flights out of Tuktoyaktuk, Northwest Territories (lat. 69° 26’N., long. 133° 02’W.) over the fast ice extending 80 km north of Tuktoyaktuk. Values of albedo of the ice cover were found to decrease during the melting period according to the equation A = 0.59 —0.32P where P is the degree of puddling of the surface.

Amplitude and frequency anomalies in regional 3D seismic data surrounding the Mallik 5L-38 research site, Mackenzie Delta, Northwest Territories, Canada

Geophysics ◽  
2006 ◽  
Vol 71 (6) ◽  
pp. B183-B191 ◽  
Author(s):  
M. Riedel ◽  
G. Bellefleur ◽  
S. R. Dallimore ◽  
A. Taylor ◽  
J. F. Wright
Keyword(s):  
Northwest Territories ◽  
Gas Hydrate ◽  
Seismic Data ◽  
Ratio Method ◽  
Unfrozen Water ◽  
3D Seismic ◽  
Mackenzie Delta ◽  
Data Set ◽  
Seismic Amplitude ◽  
3D Seismic Data

Amplitude and frequency anomalies associated with lakes and drainage systems were observed in a 3D seismic data set acquired in the Mallik area, Mackenzie Delta, Northwest Territories, Canada. The site is characterized by large gas hydrate deposits inferred from well-log analyses and coring. Regional interpretation of the gas hydrate occurrences is mainly based on seismic amplitude anomalies, such as brightening or blanking of seismic energy. Thus, the scope of this research is to understand the nature of the amplitude behavior in the seismic data. We have therefore analyzed the 3D seismic data to define areas with amplitude reduction due to contamination from lakes and channels and to distinguish them from areas where amplitude blanking may be a geologic signal. We have used the spectral ratio method to define attenuation (Q) over different areas in the 3D volume and subsequently applied Q-compensation to attenuate lateral variations ofdispersive absorption. Underneath larger lakes, seismic amplitude is reduced and the frequency content is reduced to [Formula: see text], which is half the original bandwidth. Traces with source-receiver pairs located inside of lakes show an attenuation factor Q of [Formula: see text], approximately half of that obtained for source-receiver pairs situated on deep, continuous permafrost outside of lakes. Deeper reflections occasionally identified underneath lakes show low-velocity-related pull-down. The vertical extent of the washout zones is enhanced by acquisition with limited offsets and from processing parameters such as harsh mute functions to reduce noise from surface waves. The strong attenuation and seismic pull-down may indicate the presence of unfrozen water in deeper lakes and unfrozen pore water within the sediments underlying the lakes. Thus, the blanking underneath lakes is not necessarily related to gas migration or other in situ changes in physical properties potentially associated with the presence of gas hydrate.

Crustal-scale ramp in a Middle Proterozoic orogen, Northwest Territories, Canada

1992 ◽  
Vol 29 (1) ◽  
pp. 142-157 ◽  
Author(s):  
Elizabeth A. Clark ◽  
Frederick A. Cook
Keyword(s):  
Northwest Territories ◽  
Seismic Data ◽  
Large Scale ◽  
Thrust Faults ◽  
Crustal Structures ◽  
Scale Similarity ◽  
Compressional Deformation ◽  
Middle Proterozoic

Deep crustal seismic data from the Fort Goodhope area, Northwest Territories, Canada, image crustal structures associated with Middle Proterozoic compressional deformation. These include 10–20 km wide antiforms and thrust faults that lie above a west-dipping crustal-scale ramp with at least 10 km of vertical relief. The deformation is interpreted as being associated with structures observed in the subsurface to the east and may be partly coeval with deformation originally detected in outcrop in the Rackla Range of the Wernecke Mountains. These new deep crustal profiles, coupled with data to the east that delineate structures to 15 km depth, reveal large-scale similarity between this Middle Proterozoic orogen and many Phanerozoic compressional orogens.

Introduction

Geophysics ◽  
1967 ◽  
Vol 32 (3) ◽  
pp. 415-417
Author(s):  
Sven Treurel ◽  
Enders A. Robinson
Keyword(s):  
Time Series ◽  
Data Analysis ◽  
Research Program ◽  
Seismic Data ◽  
Financial Support ◽  
Massachusetts Institute ◽  
Massachusetts Institute Of Technology ◽  
Analysis Group ◽  
Full Participation ◽  
Institute Of Technology

In 1950, a small research project concerned with the application of the theory of time series to seismic data analysis was formed within the Mathematics Department of the Massachusetts Institute of Technology. This early work was pursued by Dr. E. A. Robinson and by Professor G. P. Wadsworth. The results of these studies were considered promising, and by 1952 a number of oil and geophysical exploration companies had been approached in order to determine their interest in supporting an expanded research program in this area. Eventually a group of these companies agreed to participate in such an effort, and in February 1953 the MIT Geophysical Analysis Group (GAG) was organized within the Department of Geology and Geophysics. Full participation in the activities of the GAG was open at any time to all interested companies. All members provided annual financial support, and a number of them furnished the GAG with data for analysis.

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